Modeling a notch in paper

hi everybody,
I have cut a notch in paper and I am trying to model it which seems difficult to me as I am new to rhino. do you know how could I model it?
Thanks for the help…

any body got a clue about this?!

Hi Aslan,

How about modeling one half and mirror that?


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that seems reasonable, i am trying to model the the curve, thank you Willem